Floor-controller system for electric elevators



' March 10. 1925. 1529,4173

E. L. DUNN FLOOR CONTROLLER SYSTEM FOR ELECTRIC ELEVATORS Filed March 10, 1923 2 Sheets-Sheet l anoemfo'c March 10, 1925. 1,529,423

v E. L. DUNN FLOOR CONTROLLER SYSTEM FOR ELQCTRIC ELEVATORS Filed March 10, 9 2 Sheet-Sheet 2 Patented Mar. 10, 1925.

UNITED STATES EDWABJO L. DUNN, OI EAST ORANGE, NEW JERSEY, ASSIGNOR TO OTIS ELEVATOR COI- TANY, OE JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

FLOOR-CONTROLLER SYSTEM, FOR ELECTRIC ELEVATORS.

Application filed March 10, 1928. Serial No. 624,101.

To all whom it away concern:

Be it known that I, EDWARD L. DUNN, a citizen of the United States, residing at East Orange, in the oounty'of Essex and State of New Jersey, have invented a new and useful Improvement in Floor-Controller Systems for Electric Elevators, of which the following is a specification.

My invention .relates to control systems for electric elevators and particularly to that art of automatic electriccontrol systemsh at the desired floor landings.

In automatic electric control systems of the push button operated type, one of the conventional arrangement for obtainin automatic stops of the car at the desired floors comprises what is known as a floor controller driven by the elevator hoisting machine. The degree of accuracy of the 1 stop of the car with the desired floor landings' obtained by that arrangement is subject to the stretch of the driving ropes and, in the case of the traction type machine, to 3 the slip and cree of the driving ropes in addition. It is t e object of my invention to overcome those difiiculties by providing a floor stop switching mechanism, comprising two switches at each floor landing, each switch adjustable independently, one for up and the other for down stop of the carat the floor landings. The switching mechanism is. contained in its respective box to-' gether with the floor magnet switch. This arrangement ellminates the trouble resulting from stretch, slip or creep of the driving ropes and also reduces to a minimum the hatchway wiring required.

Figure 1 shows a vertical plan view of the inside of the floor stop switch.

Figure 2 is a side view of the same. Figure 3 shows a perspective view of the adjustable contact segment cam.

Figure 4 shows a wiring diagram of an automatic ush button control system incorporating t e floor stop switches. ,Figure 5 shows the cams on' the car to operate floor stop switches and indicates the arrangement of mounting the various floor stop switches.

Referring to Figures 1 and 2, the floor stop switch consists of a case 1 with cover 1 in which is mounted the floor magnet switch 2 with coil 3 and contact 4, the floor y which an automatic stop is obtainedstop contacts 5, 6 and: 7, the cam segments 8 and '9 for connecting these contacts and the parts for moving these cams by move ment of roller 10 as more fully described below. The magnet switch 2 is mounted on insulating block 11 by bracket 12. The stationary part of contact 4 is also mounted on insulating block 11 by contact holder 13. Contacts 5, 6 and 7 are also mounted on this same insulating block 11. 11 is attached to switch case 1 by screws 14.

This block Roller 10 is rotatably mounted on pin 15, r Y

thelatter being rigidly connected by screws 16 to upper end of arm 17. The lower end of arm 17 is rigidly connected to shaft 18 by pin 19, this shaft being journaled in bearings 20 in switch case. Insulation bracket 21 is rigidly fastened by pin 22 to shaft 18 In the lower part of switch case 1 are between bearings 20. Attached to bracket mounted two studs 31 and 32, each provided with a lock nut. These studs are adjustable and act as stops for insulation bracket 21. Since this bracket is ri 'dly connected to roller arm 17 carrying ro ler 10, these studs 31 and 32 act as stops for roller in either extreme position. No spring is used to maintain the roller in extreme position, the action of gravity being relied upon.

Figure 5 shows the cams used to operate the floor stop switches and a diagrammatic arran ement of the floor stop switches 33, 34 and 35 for three floors. It will be noted that a slot cam, which for descriptive purposes may be called two cams 36 and37, is mounted on the car C in such a way that the floor switch roller will be operated from one side to the other as the car passes an landing. Vhen the car stops at any lan ing, the roller will be held in the center position. The wiring diagram shown in Figure 4 corresponds to arrangement of floor switches shown in Figure 5.' While this shown for three lioorst-the same arrangement may be used for any number of floors. 7

Figures 4 and 5 show the elevator car at rest at the second floor. It will be noted that under these conditions the roller on Y floor sto switch 34 isheld in its central position y'cams 36 and 37 also that contacts in floor stop switch 34 are all open .asare also the reversing switch contacts 38, 39, 40 and 41; This means that there is no current on motor M nor in brake magnet B at this time. v

Assume that it is desired to bring the car to the-first floor. The closing of push button44 at first floor landingwill cause the minus line through wires 45% and 46 to push car' to run down the circuits bein as follows: the initial circuit om the button 44, wire 47,floor switch coil 3, in switch 35, and wires 48 and 49 to plus line. Coil 3 will then operate-floor switch 2 and the latter will close its-contact 4. This es= tablishes circuit for the reversing switch as follows: minus line, wire 50.'down-revers-- ing switch coil RD wire 51.and 52 to contact 5 on floor switch, contact segment 8, contact segment support 24,:contact segment 9, contact 6, wire 53, contact 4, wires 54 and 47, floor switch coil 3, wires 48 and 49 to plus-find This latter circuit becomes selfolding and is independent of the push I button 44. The reversing switch coil RD 36 on car toward the right.

a will close contacts 38 and 39 and motor and sufiicient to cause-contact segment 8 1% leave contact 5, the circuitto the reversing switch coil RD and floor switch coil 3 will be broken, the reversingswitch will open its 27 and 28.

contacts and the motor will be stopped m the 'usual we The exact point of. m,

' travel a't whic contact segment" 8 will leave cpntact 5 can be adjusted to suit the condi-, t1ons required by means o f-slot 25 and bolts When the car has stop ipd'at the lower floor, the roller 10 on switc in central position by cams 36 and 37 on car i as indicated in Figure 5 for a car sto at second floor. When the car moved own ,from the-second floor the action of cams 36 and 37 on roller 10 of switch 34' m'oved 'this rollerto its extreme right hand posi- '.tion resul err r a cr am: 9 win contacts 6 and 7 in switch .34 being bri ged'by contact cam 8, contact Same eration would When this "motion is' 35 will be held switch. leaves floor stop switch 34 in the same positionas Figure 4 shows switch I 33, both switches being in position for an up operation of the car. v

The above description of the operation of the elevator car is for a trip from the second to the first floor by the operation of the push button at the first floor landing. The same 0 eration would be obtained by using push utton-57 in car. hahe same opbe obtained in-running the car. from any 001: to any other floor except of course that diflterent push buttons and floor sto switches corresponding to the various oors would come into pla When the operation is such thatintermediate floors j are passed, the cams 36 and 37 on the car will engage the roller on floor stop switches at the intermediatefloors, moving these rollers from left to right or vice versa depending upon the direction of motion of the car.

This movement of the floor sto switch 1 roller not bpen any energize circuits 1 as'the floor switch magnet energized for any articular operation is only that one ing to the destination of the car. This movement of the rollers will however close the necessary circuits in the floor sto switch at any intermediatefloor to enab e. subsequent operation to that particular located in the fioor stop switch correspond- Referring to Figure 5 it will noted that the upper end of cam 36 and the lower end of cam 37 has a definite flare 36' and cam is to prevent breaking and to reset the roller arm of floor stop switch when car passes intermediate floors if for any reason the roller is reversed from its correct posi-- tion. Assume that the car is traveling up.

the car should be in the extreme right hand osition. Should any one of these-rollerse in any other position due to tampering or some other reason, the flare on the upper end of-the .cam 36 will strike this roller as car approaches that particular floor andthis 32'. The. purpose ofthis peculiar shape pf The rollers, on all fioor stop switches above roller will be moved vfirst to right and then,

to left as car asses the floor and will re -'v main 1n norma left hand position after car has flassed floor. If cam 36 were not shaped intermediate floor. The same con 'tion can exist for the downward motion of the car and in.this case the lower end of. will come into play, I a I -The application of the floor as given 'a ve is for the simplest condition ofan automatic push button control system.

'stop' 5 O an ect position of roller on Y floor stop switch might result in a breakage l "of 'floor stop switch parts ascar asses an 12o cam 37- The addition of any of' the well-known noninterference, self-holding, reti'r' cam doorlooking or safety circuits ordinar ly used in automatic push button control systems, to

. the circuits shown, will not chan e my invention in any way and any suc circuits have therefore been omitted.

What I claim and desire to secure by Letters Patent of the United States is:

1. In an elevator control system, the combination with a switch mechanism located in proximity to a landing, said switch mechanism comprising a member pivotally mounted below its center of gravity to bias it to either of two positions," one on either side of a vertical plane through the pivot,

and contacts adapted to be closed by said member upon its movement to either of said movement to either of said two positions;

of the elevator car and an open slot cam carried thereby and co-operat-ing with said member to move it from one of its contacting positions to the other upon movement of said car by the landing.

3. In an elevator control system, the combination with a switch mechanism comprising a member pivotally mounted below its center of gravity to bias it to either of two positions, one on either side of a vertical plane through the ed to be closed, by said member upon its movement to either of said two positions; of the elevator car and an open slot cam carried thereby and co-operating with said member pivot, and contacts adapt-v to move it from one of its contacting positions to the other upon movement of said car by the landing, said cam having at its ends flared camming surfaces, one on either side of the slot, for returning said member to its proper location in the event of it being inadvertently displaced therefrom.

'4. In the controller art of automatic electric elevators, an electric switching mech anism at each landing, comprising two contacts and a magnet floor switch, said magnet switch arranged to be in circuit with one of said contacts while elevator car is in operation.v

5. In the controller art of automatic elec tric elevators, an electric switching mechanism at each landing comprising two contacts, a magnet switch and a. contact poperated by said magnet switch, said magnet switch and its contacts arranged to be in circuit with one of the two first mentioned contacts while the elevator car is in operation.

6. In the controller art of automatic electric elevators, the combination of an electric switchin mechanism comprising a rocking adjustab e contact part and two contacts, the contact part being adapted to be rocked to make contact with either of said contacts, and a third contact ada ted to be continuously in contact with sai contacts part.

7. In the controller artof automatic electric elevators, the combination of an electric switchin mechanism comprisin a rocking adjustab e contact segment an adjustable stops therefor and two contacts, said contact segment adapted to be rocked to make contact with said contacts, and a third contact flexibly contacting with said segment in all its positions.

In testimony whereof, I have signed my name to this specification.

. EDWARD L. DUNN. 

